Interdental brush



FIG. 1 is a perspective view of an interdental brush, showing our new design.

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a fragmentary side elevational view of a second embodiment of an interdental brush; and

FIG. 6 is a fragmentary side elevational view of a third embodiment of an interdental brush. 

The ornamental design for an interdental brush, as shown and described. 